Investigation of the (γ, p) reaction in⁶Li and¹²C at 61 and 77 MeV

Abstract

The tagged photon technique has been used to measure the excitation energy spectra resulting from the (γ, p) reaction in 6Li and 12C at 90 degrees for incident photon energies around 61 and 77 MeV. Strong evidence is found for the quasideuteron absorption mechanism, not only in the high excitation energy regions, but also in bound states. Furthermore, for the 12C(γ, p) reaction the photon seems to be absorbed on pn-pairs in both T = 0 and T = 1 states.

Investigation of the40Ca(γ,N) reaction at 60 MeV

“…Within the limitations stated above, it thus seems that the (7, P'2,) cross section behaviour differs from that observed for the other decay channels. This agrees with a similar phenomenon which was observed in the 12C(7~p ) reaction [12]: also there the slope of the cross section for reactions leading to 1h-states is much steeper than in the case of 2h-lp states. This behaviour can be understood when studying the cross section as a function of the momentum mismatch.…”